Hide PingLoader lifetime implementation detail from outside view.

third_party/WebKit/Source/core/loader/PingLoader.cpp

Index: third_party/WebKit/Source/core/loader/PingLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/PingLoader.cpp b/third_party/WebKit/Source/core/loader/PingLoader.cpp
index 1a6d4ac594c36d2068ca2d4035a8357eb6f1eddd..e87262768e3104daf14c384223c9f08c52d4ee9d 100644
--- a/third_party/WebKit/Source/core/loader/PingLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/PingLoader.cpp
@@ -125,9 +125,9 @@ void PingLoader::start(LocalFrame* frame, ResourceRequest& request, const FetchI
     if (MixedContentChecker::shouldBlockFetch(frame, request, request.url()))
         return;
 
-    // Leak the ping loader, since it will kill itself as soon as it receives a response.
-    RawPtr<PingLoader> loader = new PingLoader(frame, request, initiatorInfo, credentialsAllowed);
-    loader->ref();
+    // The loader keeps itself alive until it receives a response and disposes itself.
+    PingLoader* loader = new PingLoader(frame, request, initiatorInfo, credentialsAllowed);
+    ASSERT_UNUSED(loader, loader);
 }
 
 PingLoader::PingLoader(LocalFrame* frame, ResourceRequest& request, const FetchInitiatorInfo& initiatorInfo, StoredCredentials credentialsAllowed)
@@ -135,6 +135,7 @@ PingLoader::PingLoader(LocalFrame* frame, ResourceRequest& request, const FetchI
     , m_timeout(this, &PingLoader::timeout)
     , m_url(request.url())
     , m_identifier(createUniqueIdentifier())
+    , m_keepAlive(this)
 {
     frame->loader().client()->didDispatchPingLoader(request.url());
 
@@ -164,7 +165,7 @@ void PingLoader::dispose()
         m_loader->cancel();
         m_loader = nullptr;
     }
-    deref();
+    m_keepAlive.clear();
 }
 
 void PingLoader::didReceiveResponse(WebURLLoader*, const WebURLResponse& response)